Ma ajutati va rog la urm. exercitii? :
1) f:R->R , f(x) =
- x - 1 , a)derivata functiei , b) intervalele de monotonie
2)f:(0,∞)-> R , f(x)=x-lnx , a) derivata functiei , b) pct. de extrem , c)
Răspunsuri la întrebare
Răspuns de
1
1)a)f derivat (x) =
-1
b)f derivat (x)=0⇒
-1=0⇒
=1⇒x=0
x | -∞ 0 +∞
______________________________________
f derivat (x) |-------------------0++++++++++++
______________________________________ ⇒f strict descrescataoare pe
f(x) | scade creste (-∞,0] si strict crescatoare pe
[0,+∞)
2) a)f derivat (x)=1-
=
f derivat (x)=0⇒x-1=0⇒x=1
x |0 1 +∞ f(1)=1-ln1=1-0=1
__________|_______________________
f derivat (x) |----------------0++++++++++
__________|_______________________
f(x) | scade 1 creste
c)
b)f derivat (x)=0⇒
x | -∞ 0 +∞
______________________________________
f derivat (x) |-------------------0++++++++++++
______________________________________ ⇒f strict descrescataoare pe
f(x) | scade creste (-∞,0] si strict crescatoare pe
[0,+∞)
2) a)f derivat (x)=1-
f derivat (x)=0⇒x-1=0⇒x=1
x |0 1 +∞ f(1)=1-ln1=1-0=1
__________|_______________________
f derivat (x) |----------------0++++++++++
__________|_______________________
f(x) | scade 1 creste
c)
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